bgpd/bgp_attr.h

   1 /* BGP attributes.
   2    Copyright (C) 1996, 97, 98 Kunihiro Ishiguro
   3
   4 This file is part of GNU Zebra.
   5
   6 GNU Zebra is free software; you can redistribute it and/or modify it
   7 under the terms of the GNU General Public License as published by the
   8 Free Software Foundation; either version 2, or (at your option) any
   9 later version.
  10
  11 GNU Zebra is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Zebra; see the file COPYING.  If not, write to the Free
  18 Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  19 02111-1307, USA.  */
  20
  21 /* Simple bit mapping. */
  22 #define BITMAP_NBBY 8
  23
  24 #define SET_BITMAP(MAP, NUM) \
  25         SET_FLAG (MAP[(NUM) / BITMAP_NBBY], 1 << ((NUM) % BITMAP_NBBY))
  26
  27 #define CHECK_BITMAP(MAP, NUM) \
  28         CHECK_FLAG (MAP[(NUM) / BITMAP_NBBY], 1 << ((NUM) % BITMAP_NBBY))
  29
  30 /* BGP Attribute type range. */
  31 #define BGP_ATTR_TYPE_RANGE     256
  32 #define BGP_ATTR_BITMAP_SIZE    (BGP_ATTR_TYPE_RANGE / BITMAP_NBBY)
  33
  34 /* BGP Attribute flags. */
  35 #define BGP_ATTR_FLAG_OPTIONAL  0x80    /* Attribute is optional. */
  36 #define BGP_ATTR_FLAG_TRANS     0x40    /* Attribute is transitive. */
  37 #define BGP_ATTR_FLAG_PARTIAL   0x20    /* Attribute is partial. */
  38 #define BGP_ATTR_FLAG_EXTLEN    0x10    /* Extended length flag. */
  39
  40 /* BGP attribute header must bigger than 2. */
  41 #define BGP_ATTR_MIN_LEN        2       /* Attribute flag and type. */
  42
  43 /* BGP attribute structure. */
  44 struct attr
  45 {
  46   /* Reference count of this attribute. */
  47   unsigned long refcnt;
  48
  49   /* Flag of attribute is set or not. */
  50   u_int32_t flag;
  51
  52   /* Attributes. */
  53   u_char origin;
  54   struct in_addr nexthop;
  55   u_int32_t med;
  56   u_int32_t local_pref;
  57   as_t aggregator_as;
  58   struct in_addr aggregator_addr;
  59   u_int32_t weight;
  60   struct in_addr originator_id;
  61   struct cluster_list *cluster;
  62
  63   u_char mp_nexthop_len;
  64 #ifdef HAVE_IPV6
  65   struct in6_addr mp_nexthop_global;
  66   struct in6_addr mp_nexthop_local;
  67 #endif /* HAVE_IPV6 */
  68   struct in_addr mp_nexthop_global_in;
  69   struct in_addr mp_nexthop_local_in;
  70
  71   /* AS Path structure */
  72   struct aspath *aspath;
  73
  74   /* Community structure */
  75   struct community *community;
  76
  77   /* Extended Communities attribute. */
  78   struct ecommunity *ecommunity;
  79
  80   /* Unknown transitive attribute. */
  81   struct transit *transit;
  82 };
  83
  84 /* Router Reflector related structure. */
  85 struct cluster_list
  86 {
  87   unsigned long refcnt;
  88   int length;
  89   struct in_addr *list;
  90 };
  91
  92 /* Unknown transit attribute. */
  93 struct transit
  94 {
  95   unsigned long refcnt;
  96   int length;
  97   u_char *val;
  98 };
  99
 100 #define ATTR_FLAG_BIT(X)  (1 << ((X) - 1))
 101
 102 /* Prototypes. */
 103 void bgp_attr_init ();
 104 int bgp_attr_parse (struct peer *, struct attr *, bgp_size_t,
 105                     struct bgp_nlri *, struct bgp_nlri *);
 106 int bgp_attr_check (struct peer *, struct attr *);
 107 struct attr *bgp_attr_intern (struct attr *attr);
 108 void bgp_attr_unintern (struct attr *);
 109 void bgp_attr_flush (struct attr *);
 110 struct attr *bgp_attr_default_set (struct attr *attr, u_char);
 111 struct attr *bgp_attr_default_intern (u_char);
 112 struct attr *bgp_attr_aggregate_intern (struct bgp *, u_char, struct aspath *, struct community *, int as_set);
 113 bgp_size_t bgp_packet_attribute (struct bgp *bgp, struct peer *, struct stream *, struct attr *, struct prefix *, afi_t, safi_t, struct peer *, struct prefix_rd *, u_char *);
 114 bgp_size_t bgp_packet_withdraw (struct peer *peer, struct stream *s, struct prefix *p, afi_t, safi_t, struct prefix_rd *, u_char *);
 115 void bgp_dump_routes_attr (struct stream *, struct attr *);
 116 unsigned int attrhash_key_make (struct attr *);
 117 int attrhash_cmp (struct attr *, struct attr *);
 118 void attr_show_all (struct vty *);
 119
 120 /* Cluster list prototypes. */
 121 int cluster_loop_check (struct cluster_list *, struct in_addr);
 122 void cluster_unintern (struct cluster_list *);
 123
 124 /* Transit attribute prototypes. */
 125 void transit_unintern (struct transit *);